Always load signin profile on Chrome OS startup.

chrome/browser/extensions/extension_browsertest.cc

Index: chrome/browser/extensions/extension_browsertest.cc
diff --git a/chrome/browser/extensions/extension_browsertest.cc b/chrome/browser/extensions/extension_browsertest.cc
index aa62007d19363d0e681198ff02f78025ce7aeae1..8aa28702466fb4869b4733f7a1c0a53c12d454f0 100644
--- a/chrome/browser/extensions/extension_browsertest.cc
+++ b/chrome/browser/extensions/extension_browsertest.cc
@@ -59,9 +59,6 @@ using extensions::Manifest;
 ExtensionBrowserTest::ExtensionBrowserTest()
     : loaded_(false),
       installed_(false),
-#if defined(OS_CHROMEOS)
-      set_chromeos_user_(true),
-#endif
       // Default channel is STABLE but override with UNKNOWN so that unlaunched
       // or incomplete APIs can write tests.
       current_channel_(chrome::VersionInfo::CHANNEL_UNKNOWN),
@@ -107,18 +104,6 @@ void ExtensionBrowserTest::SetUp() {
 void ExtensionBrowserTest::SetUpCommandLine(CommandLine* command_line) {
   PathService::Get(chrome::DIR_TEST_DATA, &test_data_dir_);
   test_data_dir_ = test_data_dir_.AppendASCII("extensions");
-  observer_.reset(new ExtensionTestNotificationObserver(browser()));
-
-#if defined(OS_CHROMEOS)
-  if (set_chromeos_user_) {
-    // This makes sure that we create the Default profile first, with no
-    // ExtensionService and then the real profile with one, as we do when
-    // running on chromeos.
-    command_line->AppendSwitchASCII(chromeos::switches::kLoginUser,
-                                    "TestUser@gmail.com");
-    command_line->AppendSwitchASCII(chromeos::switches::kLoginProfile, "user");
-  }
-#endif
 }
 
 void ExtensionBrowserTest::SetUpOnMainThread() {